30 Pencil Icosahedron
With this kit – plus 30 standard-sized hexagonal pencils- you can build an icosahedron shaped object (about 38 cm or 15 inch in diameter).
Use it as a lampshade, or just have it around as a fun and educational object. It fits standard hexagonal (colour) pencils of about 7.0 mm cross-section, measured at the smallest diameter. Use that set of pencils from the bottom of your drawer, get a new set or buy separate pencils of only those colours that you like.